Date: Thu, 24 Sep 1998 14:46:36 -0600 From: "Justin T. Gibbs" <gibbs@plutotech.com> To: Mike Smith <mike@smith.net.au> Cc: "Justin T. Gibbs" <gibbs@plutotech.com>, bde@FreeBSD.ORG, current@FreeBSD.ORG Subject: Re: options DPT_LOST_IRQ Message-ID: <199809242053.OAA09297@pluto.plutotech.com> In-Reply-To: Your message of "Thu, 24 Sep 1998 13:54:23 PDT." <199809242054.NAA00826@dingo.cdrom.com>
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>> If it stops asserting the interrupt, we should get a stray interrupt >> reported when we go to clear the pending mask. Is this what is happening? > >I don't actually think we should; the stray interrupt feature occurs >when an edge is seen on an interrupt line, but when the latch fires >(one or two clocks later?) there is nothing there to latch. This is >the way the 8259 works; PCI and APIC interrupt behaviour is still largely >a mystery to me. I don't have my "ISA Architecture" book here, but my understanding was that the stray was detected during the transition from pending to in-service as initiated by the CPU and not based on an "internal to the PIC" event. I don't know anything about APICs. -- Justin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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